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ZL3AI > APRDIG 29.10.06 05:36l 200 Lines 6878 Bytes #999 (0) @ WW
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To : APRDIG@WW
Today's Topics:
1. RE: 145.39 quartz crystal? (Chris Kantarjiev)
2. RE: TH-D7 and Megellan Meridian Color... (Chris Kantarjiev)
3. Re: TH-D7 and Megellan Meridian Color... (Tapio Sokura)
4. Re: TH-D7 and Megellan Meridian Color... (Jason D. Triolo)
5. RE: 144.39 quartz crystal? (was 145.39 crystal) (Art)
6. Re: 144.39 quartz crystal? (was 145.39 crystal) (Jason Winningham)
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Message: 1
Date: Mon, 16 Oct 2006 10:07:55 -0700 (PDT)
From: Chris Kantarjiev <cak_at_dimebank.com>
Subject: RE: [aprssig] 145.39 quartz crystal?
I suspect you really want 144.39, but whatever. I've been very happy buying
my crystals from
Name: West Crystal Company
Address: 10-2550 Acland Rd
Kelowna, BC V1X 7L4 CANADA
Phone: (250) 765-4833
E-mail: wcrystal_at_shaw.ca
Misc.: www.westcrystal.com
They know what holders and formulas fit what radios, and provide better
prices and service than the two big names.
>Anybody else wish they had a cheap single frequency stand alone QRP
>transmitter for APRS trackers and weather stations?
Needs to be a transceiver, not just a transmitter, to be channel-friendly -
but yes. I've been re-tuning Motorola MT500s, which can be had cheaply
on ebay, but the required crystal elements are harder and harder to find
(we've resorted to rebuilding them).
73 de chris K6DBG
------------------------------
Message: 2
Date: Mon, 16 Oct 2006 10:09:09 -0700 (PDT)
From: Chris Kantarjiev <cak_at_dimebank.com>
Subject: RE: [aprssig] TH-D7 and Megellan Meridian Color...
The D7 will *only* take 4800bps in from the GPS.
73 de chris K6DBG
------------------------------
Message: 3
Date: Mon, 16 Oct 2006 20:43:32 +0300
From: Tapio Sokura <oh2kku_at_iki.fi>
Subject: Re: [aprssig] TH-D7 and Megellan Meridian Color...
Jeffrey P. Nast wrote:
>After our local club meeting last week I had a gent ask me to help him
>set up his GPS to work on his D7. I tried some combinations of the setup
>to no avail. I didn't spend too much time on it because it was snowing
I recall someone mentioning before that older versions of TH-D7 don't
accept NMEA-sentences that contain more than three minute decimals in
lat/lons. Some current GPS receiver models output four decimals, but I
don't know if that's the case with the Magellan Meridian Color. Some GPS
receivers also let you configure how many minute decimals you want to be
output in NMEA sentences.
Tapio
------------------------------
Message: 4
Date: Mon, 16 Oct 2006 23:38:29 -0400
From: "Jason D. Triolo" <jasonacg_at_citicom.com>
Subject: Re: [aprssig] TH-D7 and Megellan Meridian Color...
I'm a D7 owner with the Sportrak Pro from Magellan, which is a Meridian
without color or removable memory, and in a smaller package. All of the
core functions are the same.
I have the GPS on the v2.1 GSA setting, although I recall having success
with the other settings as well.
It is possible to have success with running the GPS at 9600--the D7 (at
least my model) can handle it. However, for compatibility reasons, run it
at 4800. This is crucial if you want to share a single COM port with the
radio and a GPS receiver (UI-View, for example).
In the "Waypoint" menu of the D7, be sure it is set to "6digits MGN" so
that inbound data is properly stored as waypoints on the Meridian.
There should be no reason to run any gender changers between the radio and
the GPS. If it's there, my suggestion is to get rid of it. Once the three
wires are connected properly, and once the GPS has a signal, it should come
to life.
Color-coding should be as follows:
Magellan Pin 2 (Orange) to White
Magellan Pin 3 (Yellow) to Red
Magellan Pin 5 (Black) to Ground
Magellan Red is used for power only, and has no use in data transfer.
If you can get your hands on an extra Magellan cable, just remove the
serial plug altogether and directly splice the wires between the two
devices. Doiong so will also make the cable more compact for travel.
Fear not...the radio and the GPS are compatible. You may just learn some
new expletives on the journey (be sure the radio is off during this
discovery phase), but it can be done.
Hope this helps. Drop me a line if you need more info.
73 de Jason KD4ACG
------------------------------
Message: 5
Date: Tue, 17 Oct 2006 10:47:48 -0400
From: Art <KY1K_at_verizon.net>
Subject: RE: [aprssig] 144.39 quartz crystal? (was 145.39 crystal)
x-avg-checked=avg-ok-78BE7DE6
At 01:07 PM 10/16/2006, you wrote:
>I suspect you really want 144.39, but whatever. I've been very
>happy buying my crystals from
>
>Name: West Crystal Company
>Address: 10-2550 Acland Rd
>Kelowna, BC V1X 7L4 CANADA
>Phone: (250) 765-4833
>E-mail: wcrystal_at_shaw.ca
>Misc.: www.westcrystal.com
>
>They know what holders and formulas fit what radios, and provide
>better prices and service than the two big names.
OK, thanks Chris,
I was hoping for a widely available 48.13 Mhz crystal, making it possible
to build a low power FM only (stand alone, and inexpensive non-frequency
agile) transmitter for trackers and weather stations.
A 48.13 crystal makes it possible to have a single stage produce low power
on 144.39, but 48.13 is not a standard value. So, these crystals are not
cheap::>
A group buy enabling purchase of 100 units or so would make the crystal
much more reasonably priced-which is why I asked on the list. But, there
doesn't seem to be much interest within the group, even though trackers and
weather stations are becoming more popular.
I agree many would prefer a transceiver, I was interested in the transmit
only aspect.
And, yes...I did mean 144.39, the frequency in my original post was an
error.
Regards,
Art
------------------------------
Message: 6
Date: Tue, 17 Oct 2006 11:06:00 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] 144.39 quartz crystal? (was 145.39 crystal)
For not a lot more than a custom crystal ($25 single unit price at DigiKey)
you can get an AD9954 direct digital synthesis chip and generate RF signals
up to 160MHz directly. 9600 baud FSK would be nearly trivial with this
device, and 1200 baud AFSK is doable. KD7LMO picked out a harmonic and
amplified that to use it on 70cm on the picobeacon:
http://www.kd7lmo.net/picobeacon.html
You need a microcontroller to drive it, but you're gonna have a
microcontroller anyway if you're building a tracker or weather station.
One could also use this device in place of a crystal (which I think is the
intent), but for digital TX only it looks a lot easier to jump straight to
the final output waveform.
-Jason
kg4wsv
------------------------------
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